Definitions from Wiktionary (spleen)

▸ noun:  (anatomy, immunology) In vertebrates, including humans, a ductless vascular gland, located in the left upper abdomen near the stomach, which destroys old red blood cells, removes debris from the bloodstream, acts as a reservoir of blood, and produces lymphocytes.
▸ noun:  (archaic, except in the set phrase "to vent one's spleen") A bad mood; spitefulness. Compare gall.
▸ noun:  (obsolete, rare) A sudden motion or action; a fit; a freak; a whim.
▸ noun:  (obsolete) Melancholy; hypochondriacal affections.
▸ noun:  A fit of immoderate laughter or merriment.
▸ verb:  (obsolete, transitive) To dislike.
▸ verb:  To annoy or irritate.
▸ verb:  (ambitransitive) To complain; to rail; to vent one's spleen.
▸ verb:  To remove the spleen, or, by extension, to gore.
▸ verb:  To excise or remove.
▸ Also see spleen

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